It’s fairly easy to tell where the best Callibaetis action is going to happen on a lake. These insects LOVE the weedbeds. What’s really cool is that trout will often move into very shallow water to feed on the nymphs before the main hatch starts. But when they go shallow, those big trout get really spooky compared to when they are out on deeper weed flats or off the drop-offs. If you can find the travel lanes that fish use through the weedy halls of their world, you have probably hit the jackpot.
There are A LOT of commercially available Callibaetis nymph imitations out there. I’m not really interested in going into which specific ones to use here. What I can say is that there are a couple of important elements to fly selection that I have found to be rather important.
First, and most important, is size. Match the size of the most prevalent size of nymphs you can see in the water. That’s usually a 14 or 16 around here. Sometimes a 12 will do in the early season, but that may be because the fish aren’t quite as dialed in at that point, rather than because the bugs are actually bigger.
Second in my order of importance (and I think the most overlooked element) is fly profile. Mayflies in general and Callibaetis in particular are thin insects. In fact, there aren’t many fat insect in the water aside from maybe dragonfly nymphs and giant water beetles. So, those obese, poorly proportioned PT nymphs that you scored for $0.89 each in the sale bin of your local hardware store probably aren’t the best choice of patterns. Slim and sparse is what you need. In fact, some of the most effective Callibaetis nymph patterns that I’ve seen look not only anemic, but also downright absurd in their simplicity and material choice.
Third in my order of importance is color. The usual grayish-tan standard usually does just fine. On a couple of occasions, it seemed like color was more important than usual, so if you spend a bunch of time fishing or travelling to fish stillwaters that have Callibaetis hatches, you may want to carry other tones, including grayish-olive, brownish-tanish-gray, and rusty-tanish-grayish-olive. Got it?
This is a pretty big deal when fish are locked in on the Callibaetis nymphs. At least as important as fly size and profile. Maybe more important. Callibaetis nymphs are good swimmers, but they are also still tiny bugs, so that retrieve you use when fishing Clousers for striped bass needs to be left at the dock. It seems to me like they wiggle forward in short bursts that can be imitated by a series of 3-4 inch pulls, or some quick hand twists. But then, the nymphs almost always seem to stop for a bit to take a break before heading back on their way. So, a nice pause after a series of strips can be the ticket. I’ll do that most of the time, matching my flyline to the water depth – floating line and long leader in the super shallows, slow intermediate when I need a hair more depth. Fast intermediate lines seem too sinky for most of my work as I find myself hitting the weeds too soon on every cast. If you are finding fish down deeper than say 8-10 ft you may want one though, to cut down on your countdown time.
I’ve also heard that Callibaetis nymphs will swim up to the surface and back down to the weeds a few times before finally committing to hatching from the surface. So, a rising retrieve followed by a sink seems logical as well. I need to fool around with this more. Maybe an indicator and floating line or a short sink tip will do the trick.
Lastly, I’ve had a lot of fish eat a nymph suspended below a Callibaetis dry fly. Heave it and leave it. It works well.
Alright! I’ve got myself fired up to fish now. So, hopefully when you are reading this, I’ll be out on the lake. If you’ve got any thoughts to add, I’d love to hear them. You can reach me at firstname.lastname@example.org
Take Care and Fish On,
PS - Check out the POD. Turns out the trout arent the only ones who like to eat Callibaetis. Photo courtesy of Big Sky Anglers / Amanda Marquez.